Peace
Abijah rested with his ancestors and was buried in the City of David. Asa his son succeeded him as king, and in his days the country was at peace for ten years. Asa did what was good and right in the eyes of the Lord his God - 2 Chronicles 14:1-2.
Asa King of Judah
Asa's reign was marked by peace because he did what was good and right to the eyes of the Lord His God.
Obedience
Obedience to God leads to peace with God and others. In the case of Judah's kings, obedience to God led to national peace, just as God promised earlier. In our case, obedience may not always bring peace with our enemies but it will bring peace with God and complete peace in His future kingdom.
Obeying God is the first step in the path to peace.